.container{
    height: 500px;
    width: 500px;
    background-color: lightblue;
}

.item{
    height: 100px;
    width: 100px;
    margin: 10px;
    background-color: lightcoral;
    float: left;
}

.next-line{
    height: 150px;
    width: 150px;
    background-color: rgba(0, 0, 255, 0.5);
    clear: left;
}